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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3d8c2d802ff3c36e734ec451920b0b384467706c60f76f47079c7416ae5606' 
  AND token = 'd9Hpp1q+jSIb6Fh0V3VAxyPtR5R0qUS97qCfJ78oa94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}